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Error: 11305 (Standby server authentication error)
That would seem to indicate that the standby server is not set up with the same initial admin console credentials as the primary.
Any special characters in the username or pw?
Try with a set of simple ones to avoid typos etc.
Also; just to rule it out, try the setup without an ssl cert installed on either one. See if that makes it work.
Ah, thanks, Johan, for pointing that out! I did indeed overlook the deprecation notice. We'll have to get to work on a different approach to resiliency.
Good advice, Wim, thank you! Both were set up with the same name, password, and 4-digit PIN, but there was a semicolon in the password which has occasionally caused trouble on the command line.
Unfortunately, even after I switch both machines' FM Server credentials to purely alphanumeric ones, and temporarily switch both of them back to the default FM certificate, it doesn't seem to change the situation with the error 11305.
My next suspicion is that it might be a filesystem-level authentication problem. Per the manual's advice, we do keep the progressive backup folders on data volumes instead of the respective system drives—while we didn't intentionally change the account FM Server runs under, I could imagine the installer fixing permissions on the system drive but not the external drives (since we can't set those locations until after the initial setup finishes). I'll follow up on that during maintenance window tonight and update the thread if I find anything, thanks again for your help!
Just to follow up for the benefit of anyone else who's having this problem: during this week's maintenance window, I reinstalled FMS16 on the standby server one last time and rekeyed its SSL certificate. For whatever reason--whether something to do with the certificate, or something to do with a clean install really making permanent the new, semicolon-less admin password per Wim's advice--third time was the charm, and the standby connection worked. Thanks again, Wim and Johan, for your assistance!